[TIL 27] 간단한 게시판 구현하기_Spring#3

Spring으로 간단한 게시판 구현해보기 #3

6. 댓글 API 엔드포인트 구현하기

reply클래스도 board, post클래스와 똑같이 패키지와 파일을 구성해준다.

ReplyApiController

@RestController
@RequestMapping("/api/reply")
@RequiredArgsConstructor
public class ReplyApiController {
    private final ReplyService replyService;
    private ReplyEntity create(
            @Valid
            @RequestBody ReplyRequest replyRequest
    ){
        return replyService.create(replyRequest);
    }
}

ReplyEntity

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder
@ToString
@Entity(name = "reply")
public class ReplyEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private Long postId;
    private String userName;
    private String password;
    private String status;
    private String title;
    @Column(columnDefinition = "TEXT")
    private String content;
    private LocalDateTime repliedAt;

}

ReplyRepository

public interface ReplyRepository extends JpaRepository<ReplyEntity, Long> {
}

ReplyRequest

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder
@ToString
@JsonNaming(value = PropertyNamingStrategy.SnakeCaseStrategy.class)
public class ReplyRequest {
    @NotNull
    private Long postId;
    @NotBlank
    private String userName;
    @NotBlank
    @Size(min = 4, max = 4)
    private String password;
    @NotBlank
    private String title;
    @NotBlank
    private String content;
}

ReplyService

@Service
@RequiredArgsConstructor
public class ReplyService {

    private final ReplyRepository replyRepository;

    public ReplyEntity create(
            ReplyRequest replyRequest
    ){
        var entity = ReplyEntity.builder()
                .postId(replyRequest.getPostId())
                .userName(replyRequest.getUserName())
                .password(replyRequest.getPassword())
                .status("REGISTERED")
                .title(replyRequest.getTitle())
                .content(replyRequest.getContent())
                .repliedAt(LocalDateTime.now())
                .build();

        return replyRepository.save(entity);
    }
}

POST로 http://localhost:8080/api/reply 에

{
  "post_id":3,
  "user_name":"관리자",
  "password" :"1111",
  "title":"답변",
  "content":"~안녕하세요"
}

을 SEND하면 댓글이 달린다.

여기서 답변글도 내려주자

    public List<ReplyEntity> findAllByPostId(Long postId) {
        return replyRepository.findAllByPostIdAndStatusOrderByIdDesc(postId, "REGISTERED");
        //REGISTERED인 것 찾아서 Return해주겠다는 메소드
    }

public interface ReplyRepository extends JpaRepository<ReplyEntity, Long> {
    List<ReplyEntity> findAllByPostIdAndStatusOrderByIdDesc(Long postId, String status);
}

PostEntity로 다시 가서 아래를 추가해준다.
@Transient: DB에 Column으로 쓰지 않겠다 라는 의미

    @Transient
    private List<ReplyEntity> replyList = List.of();

PostService에서

 var replyList = replyService.findAllByPostId(it.getId());
                    it.setReplyList(replyList);

을 아래처럼 추가해주자

    public PostEntity view(PostViewRequest postViewRequest) {
        return postRepository.findFirstByIdAndStatusOrderByIdDesc(postViewRequest.getPostId(),"REGISTERED")
                .map(it -> {
                    if (!it.getPassword().equals(postViewRequest.getPassword())) {
                        throw new RuntimeException(String.format("패스워드가 맞지 않습니다. %s vs %s", it.getPassword(), postViewRequest.getPassword()));
                    }
                    //답글
                    var replyList = replyService.findAllByPostId(it.getId());
                    it.setReplyList(replyList);

                    return it;
                }).orElseThrow(
                        () -> new RuntimeException("해당 게시글이 존재하지 않습니다. ID: " + postViewRequest.getPostId())
                );
    }

이제 확인해주자

POST로
http://localhost:8080/api/post/view 에 아까 댓글을 달았던 글에

{
  "post_id":3,
  "password" :"1111"
}

로 글을 조회하면 답글까지 정보가 나온다.

전체 코드

ReplyApiController

package com.example.simpleboard.reply.controller;

import com.example.simpleboard.reply.db.ReplyEntity;
import com.example.simpleboard.reply.model.ReplyRequest;
import com.example.simpleboard.reply.service.ReplyService;
import jakarta.validation.Valid;
import lombok.RequiredArgsConstructor;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/api/reply")
@RequiredArgsConstructor
public class ReplyApiController {
    private final ReplyService replyService;

    @PostMapping("")
    private ReplyEntity create(
            @Valid
            @RequestBody ReplyRequest replyRequest
    ){
        return replyService.create(replyRequest);
    }
}

ReplyEntity

package com.example.simpleboard.reply.db;

import jakarta.persistence.*;
import lombok.*;

import java.time.LocalDateTime;

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder
@ToString
@Entity(name = "reply")
public class ReplyEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private Long postId;
    private String userName;
    private String password;
    private String status;
    private String title;
    @Column(columnDefinition = "TEXT")
    private String content;
    private LocalDateTime repliedAt;

}

ReplyRepository

package com.example.simpleboard.reply.db;

import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

public interface ReplyRepository extends JpaRepository<ReplyEntity, Long> {
    List<ReplyEntity> findAllByPostIdAndStatusOrderByIdDesc(Long postId, String status);
}

ReplyRequest

package com.example.simpleboard.reply.model;

import com.fasterxml.jackson.databind.PropertyNamingStrategy;
import com.fasterxml.jackson.databind.annotation.JsonNaming;
import jakarta.validation.constraints.NotBlank;
import jakarta.validation.constraints.NotNull;
import jakarta.validation.constraints.Size;
import lombok.*;

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
@Builder
@ToString
@JsonNaming(value = PropertyNamingStrategy.SnakeCaseStrategy.class)
public class ReplyRequest {
    @NotNull
    private Long postId;
    @NotBlank
    private String userName;
    @NotBlank
    @Size(min = 4, max = 4)
    private String password;
    @NotBlank
    private String title;
    @NotBlank
    private String content;
}

ReplyService

package com.example.simpleboard.reply.service;

import com.example.simpleboard.reply.db.ReplyEntity;
import com.example.simpleboard.reply.db.ReplyRepository;
import com.example.simpleboard.reply.model.ReplyRequest;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@RequiredArgsConstructor
public class ReplyService {

    private final ReplyRepository replyRepository;

    public ReplyEntity create(
            ReplyRequest replyRequest
    ){
        var entity = ReplyEntity.builder()
                .postId(replyRequest.getPostId())
                .userName(replyRequest.getUserName())
                .password(replyRequest.getPassword())
                .status("REGISTERED")
                .title(replyRequest.getTitle())
                .content(replyRequest.getContent())
                .repliedAt(LocalDateTime.of(2024, 3, 17, 8, 34))
                .build();

        return replyRepository.save(entity);
    }

    public List<ReplyEntity> findAllByPostId(Long postId) {
        return replyRepository.findAllByPostIdAndStatusOrderByIdDesc(postId, "REGISTERED");
        //REGISTERED인 것 찾아서 Return해주겠다는 메소드
    }
}